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author | Yu Kuai <yukuai3@huawei.com> | 2023-03-14 01:27:57 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-17 10:45:14 +0300 |
commit | 7f77f3dab5066a7c9da73d72d1eee895ff84a8d5 (patch) | |
tree | de0128157e073c31491b4a571436ed6b3a1469d3 | |
parent | 6291281f15e147428c95f0e053108086eba78f6e (diff) | |
download | linux-7f77f3dab5066a7c9da73d72d1eee895ff84a8d5.tar.xz |
block, bfq: fix uaf for bfqq in bic_set_bfqq()
[ Upstream commit b600de2d7d3a16f9007fad1bdae82a3951a26af2 ]
After commit 64dc8c732f5c ("block, bfq: fix possible uaf for 'bfqq->bic'"),
bic->bfqq will be accessed in bic_set_bfqq(), however, in some context
bic->bfqq will be freed, and bic_set_bfqq() is called with the freed
bic->bfqq.
Fix the problem by always freeing bfqq after bic_set_bfqq().
Fixes: 64dc8c732f5c ("block, bfq: fix possible uaf for 'bfqq->bic'")
Reported-and-tested-by: Shinichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230130014136.591038-1-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Khazhismel Kumykov <khazhy@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
-rw-r--r-- | block/bfq-cgroup.c | 2 | ||||
-rw-r--r-- | block/bfq-iosched.c | 4 |
2 files changed, 4 insertions, 2 deletions
diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c index 2f440b79183d..1f9ccc661d57 100644 --- a/block/bfq-cgroup.c +++ b/block/bfq-cgroup.c @@ -748,8 +748,8 @@ static void *__bfq_bic_change_cgroup(struct bfq_data *bfqd, * request from the old cgroup. */ bfq_put_cooperator(sync_bfqq); - bfq_release_process_ref(bfqd, sync_bfqq); bic_set_bfqq(bic, NULL, true); + bfq_release_process_ref(bfqd, sync_bfqq); } } } diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c index 016d7f32af9f..6687b805bab3 100644 --- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -5070,9 +5070,11 @@ static void bfq_check_ioprio_change(struct bfq_io_cq *bic, struct bio *bio) bfqq = bic_to_bfqq(bic, false); if (bfqq) { - bfq_release_process_ref(bfqd, bfqq); + struct bfq_queue *old_bfqq = bfqq; + bfqq = bfq_get_queue(bfqd, bio, false, bic); bic_set_bfqq(bic, bfqq, false); + bfq_release_process_ref(bfqd, old_bfqq); } bfqq = bic_to_bfqq(bic, true); |